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https://doi.org/10.5194/acp-2020-397
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-397
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 06 May 2020

Submitted as: research article | 06 May 2020

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This preprint is currently under review for the journal ACP.

New evidence for atmospheric mercury transformations in the marine boundary layer

Ben Yu1,2, Lin Yang1,3, Linlin Wang1,4, Hongwei Liu1,3, Cailing Xiao4, Yong Liang4, Qian Liu1, Yongguang Yin1, Ligang Hu1, Jianbo Shi1,2,3, and Guibin Jiang1,2,3 Ben Yu et al.
  • 1State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
  • 2Institute of Environment and Health, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310000, China
  • 3College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
  • 4Institute of Environment and Health, Jianghan University, Wuhan 430056, China

Abstract. Marine boundary layer (MBL) is the largest transport place and reaction vessel of atmospheric mercury (Hg). The transformations of atmospheric Hg in MBL are crucial for the global transport and deposition of Hg. Herein, Hg isotopic signatures in total gaseous mercury (TGM) and particulate bound Hg (PBM) collected during three cruises to Chinese seas in summer and winter were measured to reveal the transformation processes of atmospheric Hg in the MBL. Unlike the observation results at inland sites, isotopic compositions in TGM from MBL were shaped not only by mixing continental emissions, but also largely by the oxidation of Hg0 primarily derived by Br atoms. Lower air temperature could promote the positive MIF in TGM in summer, while the relative processes might be weak in winter. In contrast, the positive Δ199Hg and high ratios of Δ199Hg / Δ201Hg in PBM indicated that alternative oxidants other than Br or Cl atoms played a major role in the formation of Hg(II) in PBM, likely following the nuclear volume effect. Our results suggested the importance of local Hg environmental behaviours caused by an abundance of highly reactive species, and provided new evidence for understanding the complicated transformations of atmospheric Hg in the MBL.

Ben Yu et al.

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New evidence for atmospheric mercury transformations in the marine boundary layer B. Yu, L. Yang, L. Wang, H. Liu, C. Xiao, Y. Liang, Q. Liu, Y. Yin, L. Hu, J. Shi, and G. Jiang https://doi.org/10.5281/zenodo.3748831

Ben Yu et al.

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Latest update: 24 May 2020
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Short summary
We found that Br atoms in marine boundary layer were most possible oxidizer that transform gaseous elemental mercury into gaseous oxidized mercury, according to the mercury isotopes in the total gaseous mercury. On the other hand, Br or Cl atoms were not the primary oxidizer that produced oxidized mercury on particle. This study showed that mercury isotopes can provide new evidence that help us to fully understand the transformations of atmospheric mercury.
We found that Br atoms in marine boundary layer were most possible oxidizer that transform...
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